Perfect. 63psi minus 58psi base. FPR is doing it's job in referencing boost at least. It is odd that you had low fuel pressure at idle before the replacement. Like you never even knew you had a problem. Maybe it was the fuel filter replacement that hooked you up with more fuel. LOL Who set your IFR table up with the 42#'ers originally?

 

I never saw this thread....
https://www.performancetrucks.net/fo...d.php?t=413273

but it got me thinking, what part number is your injectors. Obviously there is a problem if I am too high on your flow rate at 58psi. I was using delphi part number 17113813.

 

I entered 48.5 for IFR and that helped quite a bit. My fuel trims are between 6 and 9 now so that is better. I did a few WOT pulls and my AFR is only off by 1 point now instead of 2-3.

I am not sure what part number my injectors are but they are the same ones that Neslon sells as a direct replacement.